Both cases stem from the investigation by Special Counsel Robert Mueller into Russian interference in the 2016 US Election.

In the first trial last month, he was convicted of five counts of tax fraud, two bank fraud charges and one of failing to disclose foreign bank accounts. He could face decades in prison when sentenced for those crimes.

According to today's court filing, the change of conspiracy against the United States includes money laundering, tax fraud, failing to disclose his foreign bank accounts, and acting as an unregistered lobbyist for pro-Russian politicians in Ukraine.

The second count, for conspiracy to obstruct justice, relates to attempts to tamper with witnesses related to his foreign lobbying.

Jury selection was due to begin on Monday on charges including conspiring to launder money, conspiring to defraud the United States, failing to register as a foreign agent and witness tampering.

It is not yet known what agreement Manafort may have made to change his plea.